Function: _wp_preview_post_thumbnail_filter

_wp_preview_post_thumbnail_filter( null | array | string $value, integer $post_id, string $meta_key )

Filters post thumbnail lookup to set the post thumbnail.

Parameters

Name Type(s) Default Value Description
$value null | array | string

The value to return - a single metadata value, or an array of values.

$post_id integer

Post ID.

$meta_key string

Meta key.

Returns

null | array

The default return value or the post thumbnail meta array.

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